硝酸铵溶液加速大坝混凝土溶蚀进程的试验研究  

Experimental study on accelerating effect of ammonium nitrate on the calcium leaching of dam concrete

作　　者：孔祥芝[1] 陈改新[1] 纪国晋[1] 李曙光[1] 

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038

出　　处：《混凝土》2017年第4期34-37,共4页Concrete

基　　金：国家重点基础研究发展计划(973计划)(2013CB035901);国家重点研发计划(十三五)(2016YFB0303601);国家自然科学基金项目(51409284);中国水利水电科学研究院青年科学研究专项(SM0145B242016;SM0145B442017)

摘　　要：工程实地调查表明,溶蚀是水工混凝土建筑物普遍存在的病害之一,其进程缓慢且试验室很难准确模拟。采用硝酸铵溶液和去离子水两种溶蚀介质对典型配合比大坝碾压混凝土试件进行加速溶蚀试验,研究硝酸铵溶液用于加速大坝混凝土溶蚀进程的适应性和加速效果。结果表明,硝酸铵溶液加速大坝混凝土溶蚀进程的效果显著,混凝土遭受溶蚀的区域可以用酚酞指示剂快速确定,与去离子水相比,1mol/L硝酸铵溶液对C_(90)25大坝混凝土溶蚀进程的加速效果约为1400倍,加速倍率随硝酸铵溶液浓度的提高而增大。Field surveys showed that calcium leaching is one of the common diseases of hydraulic concrete and is very difficult to simu- late and accurate evaluate due to it＇ s lengthy leaching process.The acceleration experiment of calcium leaching of typical mix proportion dam roller-compacted concrete was implemented,in order to study the accelerating adaptability and acceleration effect of ammonium ni- trate solution on the leaching process.The results show that the acceleration effect of ammonium nitrate solution on calcium leaching pro- cess of dam concrete is significant, the subjected area of concrete can be quickly determined by phenolphthalein indicator, compared with deionized water,the acceleration effect of 1 mol/L ammonium nitrate solution on concrete grade C9025 is about 1 400 times faster, and which is concerning with the nitrate concentration.

关 键 词：大坝混凝土 溶蚀 加速效果 硝酸铵 

分 类 号：TU528.01[建筑科学—建筑技术科学]